Andrii Skomorokhov

Port old PRs to the new version of exporter.

Fix connection issue to multiple databases.

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This PR fixes the issue https://github.com/prometheus-community/postgres_exporter/issues/528 This also speeds up response time by about twice and prevents connection errors (`pq: sorry, too many clients already`). Tested on a hundred databases...

https://jira.percona.com/browse/PMM-7000 TBD: Tests.

PMM-5086 Refactor agent model (DRAFT)

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https://jira.percona.com/browse/PMM-5086 - [ ] Build: https://github.com/Percona-Lab/pmm-submodules/pull/0 - [ ] Links to other linked pull requests (optional). --- - [ ] Tests passed. - [ ] Feature build pass. - [...

Add `ResetKeyMetadata` Method to Clear Per-Key Request Counts This PR introduces a `ResetKeyMetadata` method to `BigCache`, allowing users to reset per-key metadata such as request counts. Similar to the existing...